/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

/*  Contains file I/O functions that write/read data    */
/*  LSB first.              */

#ifdef __LIBRETRO__
#define ENDIAN_LIBRETRO
#endif

#include <stdio.h>
#include "memory.h"
#include "fceu-types.h"
#include "fceu-endian.h"

void FlipByteOrder(uint8 *src, uint32 count) {
	uint8 *start = src;
	uint8 *end = src + count - 1;

	if ((count & 1) || !count) return;  /* This shouldn't happen. */

	while (count--) {
		uint8 tmp;

		tmp = *end;
		*end = *start;
		*start = tmp;
		end--;
		start++;
	}
}

int write16le(uint16 b, MEM_TYPE *fp) {
	uint8 s[2];
	s[0] = b;
	s[1] = b >> 8;
	return((fwrite(s, 1, 2, fp) < 2) ? 0 : 2);
}

int write32le(uint32 b, MEM_TYPE *fp) {
	uint8 s[4];
	s[0] = b;
	s[1] = b >> 8;
	s[2] = b >> 16;
	s[3] = b >> 24;
	return((fwrite(s, 1, 4, fp) < 4) ? 0 : 4);
}

int read32le(uint32 *Bufo, MEM_TYPE *fp) {
	uint32 buf;
	if (fread(&buf, 1, 4, fp) < 4)
		return 0;
 #ifdef LSB_FIRST
	*(uint32*)Bufo = buf;
 #else
	*(uint32*)Bufo = ((buf & 0xFF) << 24) | ((buf & 0xFF00) << 8) | ((buf & 0xFF0000) >> 8) | ((buf & 0xFF000000) >> 24);
 #endif
	return 1;
}

int read16le(char *d, MEM_TYPE *fp) {
 #ifdef LSB_FIRST
	return((fread(d, 1, 2, fp) < 2) ? 0 : 2);
 #else
	int ret;
	ret = fread(d + 1, 1, 1, fp);
	ret += fread(d, 1, 1, fp);
	return ret < 2 ? 0 : 2;
 #endif
}

void FCEU_en32lsb(uint8 *buf, uint32 morp) {
	buf[0] = morp;
	buf[1] = morp >> 8;
	buf[2] = morp >> 16;
	buf[3] = morp >> 24;
}

uint32 FCEU_de32lsb(uint8 *morp) {
	return(morp[0] | (morp[1] << 8) | (morp[2] << 16) | (morp[3] << 24));
}

